MightyBeard7
Newbie
We have designed a custom board using the **broken link removed**. We are Using this custom board to provide Biasing voltages to the QPA1022 Amplifier.
We tested the custom board with the following set-ups:-
SETUP-1:- WITH NO LOAD(Power amplifier)
Under this setup Gate voltage is being generated and can be varied by varying VR1(10K pot). VDS is being generated and controlled by TTL input.
SETUP-2:- WITH LOAD(Power amplifier)
Under this setup, the Gate voltage is being dropped to -1.5V, because of this we are unable to set the Drain current but the Drain voltage is being generated.
For the reference find the SETUP-1, SETUP-2 and schematic snapshots..
I am unable to debug the issue. Can somebody help me in this?
SETUP-1
SETUP-2
SCHEMATIC- PAGE1
SCHEMATIC- PAGE2
We tested the custom board with the following set-ups:-
SETUP-1:- WITH NO LOAD(Power amplifier)
Under this setup Gate voltage is being generated and can be varied by varying VR1(10K pot). VDS is being generated and controlled by TTL input.
SETUP-2:- WITH LOAD(Power amplifier)
Under this setup, the Gate voltage is being dropped to -1.5V, because of this we are unable to set the Drain current but the Drain voltage is being generated.
For the reference find the SETUP-1, SETUP-2 and schematic snapshots..
I am unable to debug the issue. Can somebody help me in this?
SETUP-1
SETUP-2
SCHEMATIC- PAGE1
SCHEMATIC- PAGE2
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